4 Axis DRO Digital Readout Mill Package Linear Glass Scale 0.0002" All 4 Glass Scales Mutilfunction Display Unit Long lasting durable linear glass scale accurate in 0.0002" or 5um. Slim scale on the corss slide. All 4 glass scale cover x, y, knee and quill Pacakage include many brackets and hardware for easy installation Limited warranty cover up to 5 years